| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini comm implementation for busybox |
| * |
| * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| |
| //usage:#define comm_trivial_usage |
| //usage: "[-123] FILE1 FILE2" |
| //usage:#define comm_full_usage "\n\n" |
| //usage: "Compare FILE1 with FILE2\n" |
| //usage: "\nOptions:" |
| //usage: "\n -1 Suppress lines unique to FILE1" |
| //usage: "\n -2 Suppress lines unique to FILE2" |
| //usage: "\n -3 Suppress lines common to both files" |
| |
| #include "libbb.h" |
| |
| #define COMM_OPT_1 (1 << 0) |
| #define COMM_OPT_2 (1 << 1) |
| #define COMM_OPT_3 (1 << 2) |
| |
| /* writeline outputs the input given, appropriately aligned according to class */ |
| static void writeline(char *line, int class) |
| { |
| int flags = option_mask32; |
| if (class == 0) { |
| if (flags & COMM_OPT_1) |
| return; |
| } else if (class == 1) { |
| if (flags & COMM_OPT_2) |
| return; |
| if (!(flags & COMM_OPT_1)) |
| putchar('\t'); |
| } else /*if (class == 2)*/ { |
| if (flags & COMM_OPT_3) |
| return; |
| if (!(flags & COMM_OPT_1)) |
| putchar('\t'); |
| if (!(flags & COMM_OPT_2)) |
| putchar('\t'); |
| } |
| puts(line); |
| } |
| |
| int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int comm_main(int argc UNUSED_PARAM, char **argv) |
| { |
| char *thisline[2]; |
| FILE *stream[2]; |
| int i; |
| int order; |
| |
| opt_complementary = "=2"; |
| getopt32(argv, "123"); |
| argv += optind; |
| |
| for (i = 0; i < 2; ++i) { |
| stream[i] = xfopen_stdin(argv[i]); |
| } |
| |
| order = 0; |
| thisline[1] = thisline[0] = NULL; |
| while (1) { |
| if (order <= 0) { |
| free(thisline[0]); |
| thisline[0] = xmalloc_fgetline(stream[0]); |
| } |
| if (order >= 0) { |
| free(thisline[1]); |
| thisline[1] = xmalloc_fgetline(stream[1]); |
| } |
| |
| i = !thisline[0] + (!thisline[1] << 1); |
| if (i) |
| break; |
| order = strcmp(thisline[0], thisline[1]); |
| |
| if (order >= 0) |
| writeline(thisline[1], order ? 1 : 2); |
| else |
| writeline(thisline[0], 0); |
| } |
| |
| /* EOF at least on one of the streams */ |
| i &= 1; |
| if (thisline[i]) { |
| /* stream[i] is not at EOF yet */ |
| /* we did not print thisline[i] yet */ |
| char *p = thisline[i]; |
| writeline(p, i); |
| while (1) { |
| free(p); |
| p = xmalloc_fgetline(stream[i]); |
| if (!p) |
| break; |
| writeline(p, i); |
| } |
| } |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| fclose(stream[0]); |
| fclose(stream[1]); |
| } |
| |
| return EXIT_SUCCESS; |
| } |